Various cubic-based polymorphic phase boundary structures in (1-y)(Na0.5K0.5)(Nb1-xSbx)-yCaTiO3 ceramics and their piezoelectric properties

Tae Gon Lee, Sung Hoon Cho, Dae Hyeon Kim, Hyun Gyu Hwang, Ku Tak Lee, Chang Hyo Hong, Youn Woo Hong, Keun Hwa Chae, Ji Won Choi, Jeong Seog Kim, Sahn Nahm

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6 Citations (Scopus)

Abstract

CuO-added (1-y)(Na0.5K0.5)(Nb1-xSbx)-yCaTiO3 ceramics with 0.0 ≤ x ≤ 0.1 and 0.04 ≤ y ≤ 0.055 were sintered at 970 °C. Various cubic-based polymorphic-phase-boundary (PPB) structures were formed: orthorhombic-tetragonal-cubic, and tetragonal-cubic PPB structures. The crystal structure of the specimens near Curie temperature is a mixture of Pm3m cubic and P4mm tetragonal structures and these ceramics showed ferroelectric properties. A schematic phase diagram of these ceramics has been suggested. The piezoelectric properties of these specimens were influenced by their crystal structure. All the specimens are expected to have good fatigue properties. In particular, the specimen with a tetragonal-cubic PPB structure (x = 0.04 and y = 0.045) has a large d33 of 338 pC/N and a high strain of 0.17% at 4.5 kV/mm. This specimen has good temperature stability; a d33 value of 300 pC/N and strain of approximately 0.12% were obtained at 175 °C, indicating that this specimen is a good candidate for use as a piezoelectric multilayer actuator.

Original languageEnglish
JournalJournal of the European Ceramic Society
DOIs
Publication statusAccepted/In press - 2018 Jan 1

Keywords

  • (Na,K)(Nb,Sb)-CaTiO piezoelectric ceramics
  • Cubic-based polymorphic phase boundary structure
  • Electric-field-induced strain
  • Temperature stability of the piezoelectric properties

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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